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#ifndef LH_CSS_SELECTOR_H
#define LH_CSS_SELECTOR_H
#include "string_id.h"
#include "style.h"
#include "media_query.h"
#include "css_tokenizer.h"
namespace litehtml
{
//////////////////////////////////////////////////////////////////////////
struct selector_specificity
{
int a;
int b;
int c;
int d;
explicit selector_specificity(int va = 0, int vb = 0, int vc = 0, int vd = 0)
{
a = va;
b = vb;
c = vc;
d = vd;
}
void operator += (const selector_specificity& val)
{
a += val.a;
b += val.b;
c += val.c;
d += val.d;
}
bool operator==(const selector_specificity& val) const
{
if(a == val.a && b == val.b && c == val.c && d == val.d)
{
return true;
}
return false;
}
bool operator!=(const selector_specificity& val) const
{
if(a != val.a || b != val.b || c != val.c || d != val.d)
{
return true;
}
return false;
}
bool operator > (const selector_specificity& val) const
{
if(a > val.a)
{
return true;
} else if(a < val.a)
{
return false;
} else
{
if(b > val.b)
{
return true;
} else if(b < val.b)
{
return false;
} else
{
if(c > val.c)
{
return true;
} else if(c < val.c)
{
return false;
} else
{
if(d > val.d)
{
return true;
} else if(d < val.d)
{
return false;
}
}
}
}
return false;
}
bool operator >= (const selector_specificity& val) const
{
if((*this) == val) return true;
if((*this) > val) return true;
return false;
}
bool operator <= (const selector_specificity& val) const
{
if((*this) > val)
{
return false;
}
return true;
}
bool operator < (const selector_specificity& val) const
{
if((*this) <= val && (*this) != val)
{
return true;
}
return false;
}
};
//////////////////////////////////////////////////////////////////////////
enum attr_select_type
{
select_class,
select_id,
select_attr,
select_pseudo_class,
select_pseudo_element,
};
// https://www.w3.org/TR/selectors-4/#attribute-selectors
enum attr_matcher : char
{
attribute_exists = 0,
attribute_equals = '=',
attribute_contains_string = '*', // *=
attribute_contains_word = '~', // ~=
attribute_starts_with_string = '^', // ^=
attribute_starts_with_string_hyphen = '|', // |=
attribute_ends_with_string = '$', // $=
};
//////////////////////////////////////////////////////////////////////////
class css_selector;
class html_tag;
// <subclass-selector> | <pseudo-element-selector>
// = <id-selector> | <class-selector> | <attribute-selector> | <pseudo-class-selector> | <pseudo-element-selector>
struct css_attribute_selector
{
using vector = std::vector<css_attribute_selector>;
attr_select_type type;
string_id prefix; // [prefix|name]
string_id name; // .name, #name, [name], :name
string value; // [name=value], :lang(value)
attr_matcher matcher; // <attr-matcher> = ~= |= ^= $= *=
bool caseless_match; // value is matched ASCII case-insensitively
std::vector<shared_ptr<css_selector>> selector_list; // :not(selector_list)
int a, b; // :nth-child(an+b of selector_list)
css_attribute_selector(attr_select_type type = select_class, string name = "")
: type(type), prefix(empty_id), name(_id(name)), matcher(), caseless_match(0), a(0), b(0) {}
operator bool() const { return name != empty_id; }
};
//////////////////////////////////////////////////////////////////////////
class css_element_selector // compound selector: div.class:hover
{
public:
using ptr = shared_ptr<css_element_selector>;
public:
string_id m_prefix;
string_id m_tag;
css_attribute_selector::vector m_attrs; // subclass and pseudo-element selectors
};
//////////////////////////////////////////////////////////////////////////
enum css_combinator
{
combinator_descendant = ' ',
combinator_child = '>',
combinator_adjacent_sibling = '+',
combinator_general_sibling = '~'
};
//////////////////////////////////////////////////////////////////////////
class css_selector // complex selector: div + p
{
public:
using ptr = shared_ptr<css_selector>;
using vector = std::vector<css_selector::ptr>;
public:
selector_specificity m_specificity;
int m_order = 0;
css_selector::ptr m_left;
css_element_selector m_right;
css_combinator m_combinator = combinator_descendant;
media_query_list_list::ptr m_media_query;
style::ptr m_style;
public:
bool parse(const string& text, document_mode mode);
void calc_specificity();
bool is_media_valid() const;
void add_media_to_doc(document* doc) const;
};
inline bool css_selector::is_media_valid() const
{
if(!m_media_query)
{
return true;
}
return m_media_query->is_used();
}
//////////////////////////////////////////////////////////////////////////
inline bool operator > (const css_selector& v1, const css_selector& v2)
{
if(v1.m_specificity == v2.m_specificity)
{
return (v1.m_order > v2.m_order);
}
return (v1.m_specificity > v2.m_specificity);
}
inline bool operator < (const css_selector& v1, const css_selector& v2)
{
if(v1.m_specificity == v2.m_specificity)
{
return (v1.m_order < v2.m_order);
}
return (v1.m_specificity < v2.m_specificity);
}
inline bool operator > (const css_selector::ptr& v1, const css_selector::ptr& v2)
{
return (*v1 > *v2);
}
inline bool operator < (const css_selector::ptr& v1, const css_selector::ptr& v2)
{
return (*v1 < *v2);
}
//////////////////////////////////////////////////////////////////////////
class used_selector
{
public:
typedef std::unique_ptr<used_selector> ptr;
typedef std::vector<used_selector::ptr> vector;
css_selector::ptr m_selector;
bool m_used;
used_selector(const css_selector::ptr& selector, bool used)
{
m_used = used;
m_selector = selector;
}
};
enum {
strict_mode = 0,
forgiving_mode = 1,
forbid_pseudo_elements = 1 << 1,
};
css_selector::vector parse_selector_list(const css_token_vector& tokens, int options, document_mode mode);
}
#endif // LH_CSS_SELECTOR_H
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